Truing apparatus



May 29, 1928. 1,671,697

E. F. BURKEV TRUING APPARATUS Filed April 7, 1924 3 Sheets-Sheet 2 /NVE/vm/a EDM/ E BURKE.

May 29,1928.

E` F. BURKE TRUING APPARATUS Filed April 7, 1924 5 Sheets-Sheet 5 /N VN 7.475'. Lamnay/ME,

Fgz.

; A NHRA/5y Unirse STATE N 1,611,691 MT1-:1511il QFFICE. i

EDWARD F. BURKE, 10F NIzlVAEK,` NEW JERSEY, ASSIG-NOR TO GENERAL .MOTORS COR- PORATION, OF DETROIT," MICHIGAN, `A CORPORATION OF DELAWARE ."1

TRUING APPARATUS.

Application filed Api-u 7, 1924. serial No. 704,741.

This invention relates -to truing apparatus and is herein shown as embodied in` a machine fory automatically truingr the` race rings of roller bearings. y p i Race rings for roller bearings are usually casehardened on the surface which engages the rollers. i During the process `of carb`uriz ing, the .rings get, out of `round and, after they come from the ca-rburizing pots, must be restored to a true cylindrical shape. One of the objects of the invention, therefore, is to true race rings or other hollow articles that are out of shape. In the illustrated construction, the truing is done/hy supporting the article at one end and moving an expansible member into the article to stretch it, the expansible member `presenting a substantially `continuous expanding surface of the shape desired. for the" article. Another object is to provide apparatus for presenting the articles automatically to the expander. As shown, this is effected by an intermittently rotatable carrier, preferably actuated bythe operation of the expander. Another object is to provide mechanism which will prevent injury to the machine or `to the articles as, for example, when a defective work piece sticks to the expander.

To these ends and also to improve generally upon devices of the character indicated my invention consist-s in the various matters hereinafter described and claimed.

Referring to the drawings, Figure 1 is a plan view of the apparat-us with the expander omitted.` v

Fig. 2 is an enlargedview lookingr from the ,right of Fig. 1.-

for clearness.

F ig. 3 y clutch |lcontrolling i'nechanlsm.

Fig. 3 is a detail.

is a rear view of a: portion of the Fig. 4 is a view of the expander partly broken away and iu section.

Fig. 5 is a horizontal` section on the line 5--5 of Fig. 4,1looking in the direction of` the arrows. Fig. 6 is a front view otsome of the `mechanism of Fig. 1, to a smaller scale, and

with the parts in a different position. y

Figure 7 is a side View similar to Figurel 2 with some parts added and others omitted `The numeral 10 indicates a work` support or table preferably inclined, with its higher end to the right and front as shown inFig.A

1. Extending upwardly from the work .havingend lugs .36 and a middle lug Y trunnion 12 having. a Collar` portion 1.4 litting in "an annular recess in the .support and having a reduced threaded end '1.6 which receivesa clamping nut 18 for .fixedly securing the trunnion to the table. Rotatably mounted on the trunnion l2 is a carrier 2() having a series of scalloped'openings in its periphery to rece-ive curved platesor work holders 22. "The plates :22 have semi-cylindrical *work-engaging surfaces 24 and also flanges :26 fastened by meansot screws 28 in recessesof the carrier.` The plates 22 are removable and replaceableby other similar plates, the semi-cylindrical portions of which. are ot larger or smaller ydiameter to hold work pieces of different sizes. The articles to be treated, usually hollow rings, are inserted by theoperator `at the frontor loading station and carried around a quarter of a revolution to an expanding station which is at the right as viewed in Fig. l. Here there is fixed to the table or support 10 a thrust ring or wear plate 30 fastened byscrews 32 1n a recess.

This `plate takes 4the thrust of an expansible member which' is `thrust. into the work piece to true the. latter. .The articles are retained in the recesses of the carrier by. a curved guide 34 3,8 h which it is secured to the table. y

The articles are next carried around another quarter of arevolution toga third station to actuate a clutch controlling mechanism., The clutch 4is ordinarily intermittently actuated to operate `the expander and,` if the expander properly releases the article so that the latter is carried around to the` thirdor rear station, the article actuates the clutch when it rides against a cam face 4001i` a serrated bar y42adjustably fixed to an arm 44 pivoted `at 46 on the support and having a rearwardly extending arm 48. At the rear endof the arm 48 is a slotted opening `50 theedges of which are `rounded and are eny gaged by a vertically extending pin 52 on a.

vertical arm` 54 of` a three `armed lever pivoted at `56` to the support. A laterally extending arm 58 is forked at its endend .engages a vertical rod 60 having a collar 62 at its lower end and` pivoted at vits upper end at 64 to a horizontal arm pivotedat G8 on `the frame. Also pivoted at 64 isa rod which slides through a.: lu 72 fixed to the frame and the rod is normal y pressed i lll upwardly by a spring 74 attached at its upper end to the rod and bearing at its lower end against a washer on the fixed lug 72. The rod 70 at its upper end connects with a clutch controlling dog which causes the expanding member to descend whenever the dog is withdrawn. lf an article is properly released by the expanding member and consequently carried around to the third sta tion, it pushes the cam member 40. 42 to the rear. This swings the arms 54 and 58 clockwise (in Fig. 3) and, the forked arm 58, engaging the upper side of the collar 62. depressesthe rod and the clutch controllin rod and the expander will then descen again into the following article at the expanding station. If, however, the article sticks to the expander, so that breakage would occur if the expander carried the article down against al following article, the members 40, 42, etc., are not actuated but are pressed forwardly into the empty work recess at the third station and the machine cannot operate. The spring 74. acting through the rods 70 and 60 and the collar 62, arms 58, 54. 48 and 44, causes this forward movement of the cam member 40. As shown in Fig. 3; there is a third arm or handle 76 for controlling the clutch by hand when desired. As the articles leave the third station` theyare carried around and retained on the support by a guard 78 having a bracket 80 secured to the table by screws. At the fourth station which is at the left as shown in Fig. 1, the articles slide out by gravity, due to the inclination of the table.

The mechanism for intermittently rotating the carrier will now be described. shown in Fig. 2, studs 82 have their lower 'ends threaded in the carrier and their upper reduced ends 84 pass through a cam member-86 and au index plate 88. These i last two members are free to rotate on a reduced cylindrical portion 90 of the trunnion `12. The cam member 86 has a series of cam faces, herein shown as four, each face ending in a shoulder 94 engaged by the end of a. sliding plunger 92 carried by depending lugs 96 on a swinging arm 98, the hub of which turns on a cylindrical portion 100 of the trunnion and is held thereon by a head 102 having a stud threaded in the end of the trunnion. The plunger 92 is pressed against the cam faces by a coil spring 104 and' successively engages the shoulders 94 in the manner of a pawl and ratchet. The arm 98 is oscillated to intermittently turn the table and the table is locked intermittenthY by a1 latch engaging the index plate 88. This plate has a series of notches 106 into which fits the end 108 of a latch arm 110 pivoted at '112 to a bracket 114 fastened to the table by screws 116. A flat leaf spring 118 secured to the upper edge of the bracket bears against the upper side of the latch arm 110 and tends to hold it down. The arm is held against lateral movement by upwardly extending lugs 120 forming a part of the bracket 114. In order that the end of the latch 108 may easily enter the notches, it is beveled or inclined as at 122.

The latch arm 110 is periodically raised and lowered by the reciprocating ram of the expanding mechanism. It has a lug 124 lying in the path of a hook 126 carried on a swinging arm pivoted at 128to a plate 130 on the ram 170. A flat spring 132 attached to the plate holds the hook 126 in a position such that it will always engage the lug 124. `As the hook 126 rises with the ram, it engages lug 124 and lifts the latch arm 110 whereupon the carrier can be r0- tated a portion of a revolution by the mechanism to be described. As the hook rises. it moves further away from the pivotY 112 of the latch arm and releases the lug 124 so that the end 108 of the latch can ride along the top of the, index plate` 88 as the latter is turned and drop into the next notch 106. This accurately positions the carrier and the work piece in the proper position to be acted on bg' the expander.

T e mechanism forswinging the arm 98 to intermittently turn the carrier will new be described. Sec Figs. 1, 2 and 6. A bracket 134 is attached by screws 136 to the support 10 and has spaced bearings 138 and for a sliding rod 142. The rod is flattened at one end and carries a depending stud 144 engaging a slot 146 in the arm 98 and a coil spring 148 `is ksleeved on the rod and bears at one end against the bearing 138 As and at the other end against a collar 150 fixed to the rod. The spring is shown in its compressed position in Fig. 1 and in an expanded position in Fig. 6. The spring is compressed during the descent ofthe plunger and is thus energized so that` when permitted to expand, it will force the rod back to yicldingly turn the carrier. Projecting from the collar 150, is a stud 152 engaging a slot 154 in an arm 156 ot a bell crank lever pivoted at 158 between standards 160 on thc bracket piece. Another arm 162 of the bell crank lever has its ends slotted as at 164 and engages a pin 166 projecting horizontally from a plate 168 attached to the ram 170. It is apparent that the descent of the ram or plunger will cause the rod to slide and compress the spring and that, when the plunger rises and thelatch is lifted .from the index plate, the spring will then cause the rod to slide back and swing the arm 98 and turn the carrier. 4

Referring to Figs. 4` and 5, a holder 172 iscarried by the reciprocating ram 170 and in turn carries a core 174 having a threaded shank 176 screwed into the holder and locked by a plate 178 and set screw 180. The core is in the form of"a"rustuin ofaj pyramid having flat pyramidal faces 182, each having a longitudinalkey 186 engaging a" slot 184 in ay clamping section 188l 'lheclainping sectionsyhave fiatlfacesengaging the fiat faces of the frustumand are" arrangedV to move longitudinally thereon.I The clamping sections, ot' which "sixjareshowlr, have outer c lindrical surfaces which forin'a substantia ly continuous outercylindrical"`sur face to engage the interior of a ring or other hollow article. Such a ring is indicated at R in 4.. Each clamping sectioril188 has peripheralslots 190 engaged by split spring rings 192` which constantly tend to press the sections towards the core'so that when the sections are movedftothe small endof the frustum,`they are -collapsed to o their smallest diameters.` At the upper ends of the sections are llateral extensions o`r`projeetions 194 held infan annular recess of the holder by a retaining ring 196fa`stenell to the holder by screws 198.` Therecess is deeper than the thickness Iofthe projections and of larger diameter sothatthe sections have lost motion connection with the holder both vertically and horizontally."Springs 200 are arranged in recessesin `theholder and press against the extensions 194` and, whenever the l1olde`r`is`lifted, move the cxtensions'` against the retaining ring. In this position, the sections are at the small end of the frustum and are colla'psedby means of the split spring rings 192. "`I`Ience,fthe` exander caneasily enterithering Rand as it enters the ring, the lowen ends of the sections 188 strike the thrust plate 30on the table and then continued descentof `the'core or frustuni 174 wedges the sectionsoutwardly, thus expanding the ring and restoring it to a true cylindrical shape;l In allpositions of adjustment, `the sections present `1aftrue cylindrical surface toengagethearticlef `Alth`ough the invention has been described `by referenceto specific apparatus,`it" should be understoodfthat, initsrbroader aspects, it is not necessarily limited to the precise form which has been selected `for illustrative purposes. p p Iclaim: f, y 1. In apparatus `of the character described, a carrier for hollow articles, areciprocating member, an expansible member supported by the reciprocating `member and movable into `the articles to true the same, and means operated by the reciprocating member for `intermittently moving the carrier; substantially as described. i

2. In apparatus of the characterdescribed, a rotatable carrier for hollow articles, a reciprocating member, an expander carried by the reciprocating member and having a substantially continuous outer cylindrical surface `movable into the articles to true the same, and means operatedby the reciprocating member for interniittently` rotating the carrierlto bring the articlessuccessively into thefpath of the expander, substantially `as described.l y

`the path ofthe expansible member; substantially i as described.

" In Yapparatus of the character described, a y rotatable carrier having a. series of openingsto receive hollow articles, a reciprocat-ing "member having an expander lnovableinto the `articles at one station to truelthearticles, and `means operated by the reciprocating member for intermittently rotating'the carrier;` substantially as described.

`5 fl`napparatus of the character desciiibed,` an article supporthaving one end higher "than the other, a rotatable carrier overlying jthe support and having a series of scalloped,openings to receive hollow articles andslide them laterally while they rest on the article support,` an l expansible `member movablegintothe articles at one station to true the "same, means "for expanding the member, and means for intermittentlyrotating the carrier;l substantially `as described; f l6. In apparat-us of the character described.` a carrier having means to hold hollow articles, awork supportunder the car rier for supportingr articles during the movement" ofthe" carrier, fan `eirpansible member 'movable"successively into the articles to true l the same, and means 'formoving the expansible member` against" the support to cause the expansion; substantially/as described.

"7.` In apparatus for truing hollow sleeves `andthe like; aiiat support for ysupporting a sleeve oncnd". apluralityof sections forming a substantially continuous cylindrical expansible surface. outwardly extending `projections at one endpf "said sections, a

holderhaving a recessto receive said pro 4iections.,` means for loosely retaining the pro- `jections in the recess, springs engaging said projections and urging the sections downwardly in the recess. a core fixed to the holder land" having inclined fiat faces engaging correspondingr faces on the interior of thc sections, and means for reciprocating the holder to carry the sections into contact with the support to expand the sections Within the sleeve; substantially as described.

'8. In apparatus for truing hollow sleeves and the like, a member for contacting with one end of a sleeve. a plurality of sections forming .a substantially continuous, cylindrical expansive surface, a holder having lUt) vertical and horizontal lost motion connections with the sections, a core rigidly Secured to the holder and having a plurality of flat inclined faces engaging corresponding faces on the interior of the sections, and means for causing a relative movement between the member and the holderl to expand theV sections against the interior of the sleeve: substantially as described.

9. In apparatus for truing hollow sleeves and the like, a member for contacting with oneend of a sleeve, a plurality of sections having fiat inclined faces, a central core having Hat inclined faces engaging the flat faces of the sections, means for loosely holding the sections to the core, said sections having a substantially continuous outer cylindrical truing surface, and meansl for causing a relative movement of approach between the `member and the core for expanding the sections to true the inner surface of a sleeve; substantially as described.

10. In apparatus of the character described. a rotatable carrier having a series of openings to receive hollow articles, an eXpansible member movable into the articles at one station, a clutch controlling member projecting into the path of the articles at another station to control the movement ct the expansible. member, and means for intermittently rotating the carrier; substantially as described.

11. In apparatus of the character vdescribed, a flat support having one end higher than the other. a rotatable carrier overlying the support and having a series of scalloped openings to receive hollow articles,'an expansible member for engaging the articles at a high station, means for retaining the articles ,in their openings till they reach a low station; and means for intermittently rotating the carrier; substantially as described.

12. In apparatus of the character described` a dat support having one end higher than the other. a rotatable carrier overlying the support and having aseries of scalloped openings to receive hollow articles, an expansible member movable into the. articles at the high station. a clutch controlling member projecting into the path of the articles at another-station, a curved guard beyond the last said station to retain the articles on the carrier till the articles reach the low station, and means for intermittently rotating the carrier, substantially as described. y A f 13. In apparatus of the, character described, a rotatable carrier for hollow articles,.an expansible member movable into the articles at one station, a plunger for operating said membera spring compressed by the movement of the plunger, and a oneway connection between the spring and the carrier for intermittently rotating the latter; substantially as described.

14. In apparatus of the character described, a rotatable carrier for hollow articles, an expansible member movable into the articles at one station, a plunger for operat-` ing said member, a spring compressed by the movement of the plunger in one direction, a oneway connection between the spring and the carrier, means for latching the carrier against rotation, and means operated by the movement of the plunger in the other direction to release said carrier; substantially as described. l

15. In apparatus of the l character described, a rotatable carrier for hollow articles. an expansible member movable into the articles at one station, a plunger for operating said member, a sliding rod. a connection between said plunger and said rod to slide the latter in one direction. a spring com-` pressed by the movement of said rod, and a. one-way connection between the rod and the carrier `for intermittently rotating the latter; substantially as described.

16. In apparatus of the character de-.

scribed, a rotatable carrier, a reciprocating plunger, a spring energized by the movement of the plunger in one direction, a onewa-y connection betweenthe spring and the carrier, andv means operated by the movement of the plunger in the other direction to render said spring effective to turn thecarrier; substantially as described.

17. In apparatus of the character described, a rotatable carrier, a reciprocating plunger, a spring energized by the movement of thel plunger in one direction, a one-way connection between thefspring and the earrier, a pivoted latch for the carrier, and means connected to the plunger Vfor lifting said latch; substantially as described.

In testimony whereof I hereunto aix my signature.

EDW. F. BURKE. 

